test: ☑️ improve snapshot testing

[rodneylab]

Description

Add GraphQL queries to snapshot input files, for more robust and maintainable tests.

Type of change

• Test

How Has This Been Tested?

• cargo test run with all tests passing

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 81.81818% with 4 lines in your changes missing coverage. Please review.

Project coverage is 86.04%. Comparing base (0a36fbe) to head (f513908).

Files with missing lines	Patch %	Lines
src/model/tests.rs	81.81%	4 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
- Coverage   86.27%   86.04%   -0.24%     
==========================================
  Files           8        8              
  Lines        1086     1096      +10     
==========================================
+ Hits          937      943       +6     
- Misses        149      153       +4     

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